The same forces are weighing on corporate balance sheets.

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In his 2008 book, A Question of Balance, Weighing the Options on Global Warming Policies, Professor Nordhaus provided the computed discounted costs and benefits for a variety of policies, assuming the IPCC central value for warming due to increased atmospheric CO2 (3 degrees C for doubling of CO2).

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But the old balance scale still appears in art as a symbol of justice, weighing the claims of disputing parties.

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But many friendly governments, weighing both the dangers and their own self-interest, may reach a different conclusion about the balance of risks.

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Early balance scales--first seen in Sumeria about 9, 000 years ago--consisted of two weighing pans attached to either end of a beam, which sat delicately balanced on a central pivot.

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